Optika Atmosfery i Okeana Journal

Vol. 7, issue 10, article # 11

Lebedev N. E., Stanichnyi S. V. Relation between the downward atmospheric radiation in the infrared range from 10 to 12 mm and the integrated transmittance. // Atmospheric and oceanic optics. 1994. V. 7. No. 10. P. 758-760. PDF
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Abstract:

The relation between the integrated atmospheric transmittance P₀ and the downward and near—horizontal atmospheric radiation I(0) and I(90) is presented in the form of the expression I(0)/I(90) = C₀ (1 - P₀), where C₀ = 0.92 ... 0.93. It is based on the LOWTRAN—7 model calculations and on the analytical calculations using parametrizations for the vertical temperature profiles and atmospheric transmittance function. The absolute accuracy of determining P₀ according to this relation is estimated to be 0.02. The practical accuracy of determining P₀ from experimental values of I(0) and I(90) is equal to 0.035 ... 0.025 for P₀ = 0.5 ... 0.85. The calculations of P₀ are described on the basis of the experimental data obtained in the water area of the Atlantic Ocean in spectral regions between 11 and 12 mm. The dependence of P₀ on the ambient humidity above the water surface is close to linear relation.